Electrical Systems - Chassis
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2 0 0 2 N E P T U N E
9 • 273
Troubleshooting:
The dash A/C
/
Heat system uses a combination of compressed air
(developed by the chassis system), vacuum air (developed by the vacuum
generator) and electric relays and vacuum switches. Therefore, any repair can
be classified in one of five categories:
• Electrical • Vacuum • Air Conditioner • Heater • Defroster
NOTE: Operate the air conditioning compressor once a
month to maintain lubrication of compressor seals and other
internal components of the system. If the air conditioning
system has not been operated for longer than one week, ini-
tially engage the compressor when the engine is at idle. This
prevents sudden high-speed operation of non-lubricated
compressor components.
The following information is provided to assist in troubleshooting
common operational problems which may occur.
No Heating:
1. A/C switch is turned off.
2. Blower switch is turned off.
3. Verify the proper engine coolant level.
4. Verify that the engine is reaching operating temperature.
5. Verify engine coolant is reaching water valve attached to unit.
6. Verify operation of water valve to permit engine coolant to pass
through valve to heater core.
7. Check unit fuses.
8. Check power supply to water valve and grounding.
9. Check wiring.
10. Engine thermostat faulty.
No Cooling:
1. Check blower is operating, A/C switch is in A/C or Max position,
temperature control is turned to Max cooling (blue area).
2. System fuses are not blown.
3. Condenser fan is operating.
4. Check power supply to unit and grounding of system.
5. Check wiring.
6. Coolant valve leaking.
7. Drive belt loose or broken.
8. Compressor Clutch inoperative, will not engage.
9. Expansion Valve faulty or frozen.
10. Thermostat control faulty.
11. Mode control switch faulty.
12. Compressor faulty.
13. Loss of refrigerant.
Summary of Contents for 2002 NEPTUNE
Page 12: ......
Page 28: ...General Information 2 0 0 2 N E P T U N E 1 28 NOTES...
Page 32: ......
Page 73: ...Driving Safety 2 0 0 2 N E P T U N E 2 73 Rear View VIEWS Front View OM010726 OM010725...
Page 74: ...Driving Safety 2 0 0 2 N E P T U N E 2 74 Curbside View Roadside View OM010724 OM010723...
Page 82: ......
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Page 182: ......
Page 202: ...Water Systems 2 0 0 2 N E P T U N E 6 202 NOTES...
Page 204: ......
Page 218: ...LP Gas System 2 0 0 2 N E P T U N E 7 218 NOTES...
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Page 279: ...Electrical Systems Chassis 2 0 0 2 N E P T U N E 9 279 NOTES...
Page 280: ...Electrical Systems Chassis 2 0 0 2 N E P T U N E 9 280 NOTES...
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Page 331: ...Chassis Information 2 0 0 2 N E P T U N E 10 331 MAINTENANCE RECORD...
Page 332: ...Chassis Information 2 0 0 2 N E P T U N E 10 332 MAINTENANCE RECORD...
Page 333: ...Chassis Information 2 0 0 2 N E P T U N E 10 333 MAINTENANCE RECORD...
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Page 337: ...INDEX...
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